<html>
<head>
    <meta charset="utf-8">
    <title>websocket通讯</title>
</head>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
    var socket;

    function openSocket() {
        if (typeof (WebSocket) == "undefined") {
            console.log("您的浏览器不支持WebSocket");
        } else {
            console.log("您的浏览器支持WebSocket");
            //实现化WebSocket对象，指定要连接的服务器地址与端口  建立连接
            //等同于socket = new WebSocket("ws://localhost:8888/xxxx/im/25");
            //var socketUrl="${request.contextPath}/im/"+$("#userId").val();
            var socketUrl = "http://localhost:8011/chat/" + $("#userId").val();
            socketUrl = socketUrl.replace("https", "ws").replace("http", "ws");
            console.log(socketUrl);
            if (socket != null) {
                socket.close();
                socket = null;
            }
            socket = new WebSocket(socketUrl);
            //打开事件
            socket.onopen = function () {
                console.log("websocket已打开");
                //socket.send("这是来自客户端的消息" + location.href + new Date());
            };
            //获得消息事件
            socket.onmessage = function (msg) {
                console.log(msg.data);
                //发现消息进入    开始处理前端触发逻辑
                var parse = JSON.parse(msg.data);

                if(parse.isSystem){
                    $("#message").append("<div id='systemMsg'>" + parse.message + "</div>")
                }else{
                    $("#message").append("<div id='userMsg'>来自User" + "{" + parse.userId + "} :" + parse.message + "</div>")
                }
            };
            //关闭事件
            socket.onclose = function () {
                console.log("websocket已关闭");
            };
            //发生了错误事件
            socket.onerror = function () {
                console.log("websocket发生了错误");
            }
        }
    }

    function sendMessage() {
        if (typeof (WebSocket) == "undefined") {
            console.log("您的浏览器不支持WebSocket");
        } else {
            console.log("您的浏览器支持WebSocket");
            console.log('{"toUserId":"' + $("#toUserId").val() + '","content":"' + $("#content").val() + '"}');
            socket.send('{"toUserId":"' + $("#toUserId").val() + '","content":"' + $("#content").val() + '"}');

            $("#message").append("<div id='userMsg'>回复User" + "{" + $("#toUserId").val() + "} :" + $("#content").val() + "</div>")
        }
    }
</script>
<body>
<div>userId: <input id="userId" name="userId" type="text"></div>
<div>toUserId: <input id="toUserId" name="toUserId" type="text"></div>
<div>message: <input id="content" name="contentText" type="text" value="hello websocket"></div>
<br>
<div>
    <button onclick="openSocket()">开启socket</button>&nbsp;&nbsp;&nbsp;<button onclick="sendMessage()">发送消息</button>
</div>

<br>
--------消息内容-------
<p id = "message">

</p>
</body>

</html>